M4.3 Earthquake 146 km S of Miyakojima, Japan — October 30, 2025
2025-10-30 20:36:51 UTC (2025-10-30) · approx. 4:36 AM UTC+8 local
On October 30, 2025 at 20:36 UTC, a magnitude 4.3 shallow crustal earthquake struck 146 km S of Miyakojima, Japan, at a depth of 10.0 km and coordinates 23.4679°, 125.3959°.
Physical scale: An earthquake of magnitude 4.3 releases seismic energy equivalent to roughly 43 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 558 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
125.3959°E
Technical Information
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Common Questions
How strong was the magnitude 4.3 earthquake near Miyakojima, Japan?
The magnitude 4.3 earthquake that struck 146 km S of Miyakojima, Japan on October 30, 2025 at 20:36 UTC had a depth of 10.0 km. For context, this was a light earthquake commonly felt near the epicenter.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.3 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.3 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000rkg3). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, October 30, 2025). M4.3 Earthquake 146 km S of Miyakojima, Japan — October 30, 2025. Retrieved January 27, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000rkg3/